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Radio and Micro Waves
- 1. 1. All soundwaves are . A. longitudinal waves B. transverse waves C. electromagnetic waves D. standing waves E. loud 2. The speed of sound depends on . A. the temperature of the medium B. the density of the medium C. the type of medium D. how well the medium will transfer energy E. All of the above 3. A sonar device can use echoes of ultrasound under water to find . A. the speed of sound B. the depth of the water C. the temperature of the water D. underwater objects E. both B and D 4. During a thunderstorm, you see lightning before you hear thunder because . A. the thunder occurs after the lightning B. the thunder is farther away than the lightning C. sound travels faster than light D. light travels faster than sound E. light travels in the form of a wave and sound does not
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- 3. Electromagnetic SpectrumElectromagnetic Spectrum EMS “light”from the sun Most of the EMS can not be seen
- 6. Electromagnetic SpectrumElectromagnetic Spectrum Electromagnetic waves Do not require a medium Transverse waves
- 7. Radio WavesRadio Waves Longest wavelengths Lowestenergy AM, FM, TV, Shortwave Can’t see these!
- 8. Radio WavesRadio Waves Keylessentry Garage door openers
- 9. MicrowavesMicrowaves Higher energy thanradio waves Shorter wavelength Can’t see these!
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- 11. Cell PhonesCell Phones Usewavelengths/frequencies right on the dividing line between radio and micro waves
- 12. In half-duplex radio,both transmitters use the same frequency. Only one person can talk at a time
- 13. In full-duplex radio,the two transmitters use different frequencies, so both people can talk at the same time. Cell phones are full- duplex.